Oracle数据库，查看每张数据表的空间大小

select * from (
select t.tablespace_name,t.owner, t.segment_name, t.segment_type, sum(t.bytes / 1024 / 1024) mb
from dba_segments t
where t.segment_type='TABLE' and t.owner='DB-NAME'
group by t.tablespace_name,t.OWNER, t.segment_name, t.segment_type
) t
order by t.mb desc